How did you get Vs1? It isn't 10V, because some of the voltage goes to C5,
if you correctly found the Vs1 and just didn't show the work then it looks right to me.
I would find the Qs2 = Qp1 and then find how much Q goes to the different parts of p1 - how much of Qp1 goes to C4 and how much goes to s1.